Chemical states and local structure in Cu-deficient CuxInSe & SIM;2 thin films: insights into engineering and bandgap narrowing
- Authors
- Mohamed, Ahmed Yousef; Han, Byoung Gun; Jang, Hyeonseo; Jeon, Jun Oh; Kim, Yejin; Jang, Haeseong; Kim, Min Gyu; Lee, Kug-Seung; Cho, Deok-Yong
- Issue Date
- Sep-2023
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY C, v.11, no.35, pp 12016 - 12028
- Pages
- 13
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY C
- Volume
- 11
- Number
- 35
- Start Page
- 12016
- End Page
- 12028
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/69469
- DOI
- 10.1039/d3tc02135a
- ISSN
- 2050-7526
2050-7534
- Abstract
- The Cu-deficient CuxInSe & SIM;2 (x > 0.3) phase can be stabilized as a thin film. A uniform Cu-deficient composition with a chalcopyrite structure was obtained by the precision engineering of a two-step synthesis process involving electron-beam evaporation and Se vapor deposition. Detailed structural and chemical analyses were performed employing various X-ray and microscopic techniques to demonstrate that the chemical states and local structure in the Cu-Se-In tetrahedral networks change with the loss of Cu, the In-Se bond becomes shorter, and the In ions become excessively oxidized without phase separation. Moreover, the results indicate that the bandgap narrowing is primarily attributed to the reconstruction of In3+& delta; 5s orbital states. The bandgap narrows from 1.51 eV to 1.4 eV, which is optimal for the photon absorber. Therefore, cation-deficient selenide is promising for stable nontoxic photovoltaics with tunable bandgaps.
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